I had an '84 Seville that frustrated my mechanic and bankrupted me...but I loved that car!
I think if you do a search for wheel paint and prep you'll find plenty of info on how to restore the factory look... there are plenty of chromes for sale so you might want to consider just getting another set... the lower body/bumper cladding was sometimes painted to match the car, but that wasn't for all years/all models... my '87 300e is white with gray plastic and black plastic inserts on the bumper - later years were painted body color with black inserts...

Best of luck and farewell to the Caddy